History Graph keeps everything on your own device and sends nothing anywhere.
There are no servers, no accounts, no analytics, and no third parties. The extension makes no network requests of its own.

To build your history graph, the extension stores, locally, a record of your main-frame navigations. For each navigation this may include:

• The page URL
• The page title and favicon
• A timestamp
• The browser tab it occurred in, and the parent navigation it came from (so the graph can show how pages link to one another)

This data is only ever recorded for ordinary top-level page navigations in your own browser.

All recorded data is stored locally on your device only, using your browser's built-in storage:

• IndexedDB — the persistent store for your navigation history.
• storage.session — short-lived, in-memory state the extension needs to reconstruct relationships between pages; it is cleared when your browser closes.

The extension does not transmit this data off your device. It is not sent to the developer or to any other party, because the extension makes no outbound network connections.

Because the data lives only in your browser, you are in full control of it:

• Stop recording / remove everything: uninstalling the extension removes its locally stored data, per your browser's normal handling of extension storage.
• Clear browser storage: clearing the extension's site/storage data through your browser will delete the recorded history.